JP5979301B2 - Power transmission device and power reception device - Google Patents

Power transmission device and power reception device Download PDF

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JP5979301B2
JP5979301B2 JP2015502722A JP2015502722A JP5979301B2 JP 5979301 B2 JP5979301 B2 JP 5979301B2 JP 2015502722 A JP2015502722 A JP 2015502722A JP 2015502722 A JP2015502722 A JP 2015502722A JP 5979301 B2 JP5979301 B2 JP 5979301B2
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power transmission
dielectric
power
electrode
passive
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JPWO2014132518A1 (en
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博宣 高橋
博宣 高橋
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Murata Manufacturing Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/05—Circuit arrangements or systems for wireless supply or distribution of electric power using capacitive coupling

Description

本発明は、非接触方式で電力を伝送するワイヤレス電力伝送システムに関する。   The present invention relates to a wireless power transmission system that transmits power in a contactless manner.

代表的なワイヤレス電力伝送システムとして、送電装置の一次コイルから受電装置の二次コイルへ磁界を利用して電力を伝送する磁界結合方式のものが知られている。このワイヤレス電力伝送システムでは、磁界結合で電力を伝送する場合、各コイルを通る磁束の大きさが起電力に大きく影響するため、一次コイルと二次コイルとの相対位置関係に高い精度が要求される。また、コイルを利用するため、各装置の小型化が難しい。   As a typical wireless power transmission system, a magnetic field coupling system is known in which power is transmitted from a primary coil of a power transmission device to a secondary coil of a power reception device using a magnetic field. In this wireless power transmission system, when transmitting power by magnetic field coupling, the magnitude of the magnetic flux passing through each coil greatly affects the electromotive force. Therefore, high accuracy is required for the relative positional relationship between the primary coil and the secondary coil. The Moreover, since coils are used, it is difficult to reduce the size of each device.

一方、特許文献１に開示されているような電界結合方式のワイヤレス電力伝送システムも知られている。このワイヤレス電力伝送システムでは、送電装置の結合電極から受電装置の結合電極に電界を介して電力が伝送される。電界結合方式は、結合電極の相対位置精度が磁界結合方式よりも緩く、また、結合電極の小型化及び薄型化が可能である。   On the other hand, an electric field coupling type wireless power transmission system as disclosed in Patent Document 1 is also known. In this wireless power transmission system, power is transmitted from the coupling electrode of the power transmission apparatus to the coupling electrode of the power receiving apparatus via an electric field. In the electric field coupling method, the relative positional accuracy of the coupling electrode is looser than that of the magnetic field coupling method, and the coupling electrode can be reduced in size and thickness.

国際公開第２０１１／１４８８０３号パンフレットInternational Publication No. 2011/148803 Pamphlet

電界結合方式のワイヤレス電力伝送システムの結合電極は、アクティブ電極およびパッシブ電極で構成される。電界結合方式のワイヤレス電力伝送システムにおいて高い電力伝送効率を得るには、電界結合係数を極力高めることが重要である。そのため、送電装置側のアクティブ電極と受電装置側のアクティブ電極との対向面積を大きくし、送電装置側のパッシブ電極と受電装置側のパッシブ電極との対向面積を大きくすることが有効である。また、送電装置に受電装置が接している状態で、アクティブ電極同士の間隙およびパッシブ電極同士の間隙を狭くするため、各電極表面の絶縁層の厚みを薄くすることも有効である。   The coupling electrode of the electric field coupling type wireless power transmission system includes an active electrode and a passive electrode. In order to obtain high power transmission efficiency in an electric field coupling type wireless power transmission system, it is important to increase the electric field coupling coefficient as much as possible. Therefore, it is effective to increase the facing area between the active electrode on the power transmitting device side and the active electrode on the power receiving device side, and to increase the facing area between the passive electrode on the power transmitting device side and the passive electrode on the power receiving device side. It is also effective to reduce the thickness of the insulating layer on the surface of each electrode in order to narrow the gap between the active electrodes and the gap between the passive electrodes while the power receiving apparatus is in contact with the power transmitting apparatus.

しかし、受電装置のパッシブ電極の電位は、ＤＣ的またはＡＣ的に受電装置の基準電位であることが一般的に好都合である。この場合、受電装置の基準電位を安定化する意味で、受電装置のパッシブ電極の電位を安定化する必要がある。そのためには、送電装置側のパッシブ電極と受電装置側のパッシブ電極との間に生じる容量が、送電装置側のアクティブ電極と受電装置側のアクティブ電極との間に生じる容量より大きいことが条件となる。すなわち、送電装置のパッシブ電極と受電装置のパッシブ電極との対向面積を確保することで、アクティブ電極同士の対向面積は相対的に小さくなる。したがって、送電装置と受電装置との限られた対向面積で高い結合係数を確保しつつ受電装置の基準電位の安定化を図ることは困難であった。   However, it is generally convenient that the potential of the passive electrode of the power receiving device is the reference potential of the power receiving device in terms of DC or AC. In this case, in order to stabilize the reference potential of the power receiving device, it is necessary to stabilize the potential of the passive electrode of the power receiving device. For this purpose, the capacitance generated between the passive electrode on the power transmission device side and the passive electrode on the power reception device side is larger than the capacitance generated between the active electrode on the power transmission device side and the active electrode on the power reception device side. Become. That is, by ensuring a facing area between the passive electrode of the power transmission device and the passive electrode of the power receiving device, the facing area between the active electrodes becomes relatively small. Therefore, it has been difficult to stabilize the reference potential of the power receiving device while securing a high coupling coefficient with a limited facing area between the power transmitting device and the power receiving device.

そこで、本発明の目的は、上記課題に鑑み、パッシブ電極の面積を過度に大きくすることなくパッシブ電極間の容量値を確保できるようにしたワイヤレス電力伝送システムにおける送電装置および受電装置を提供することにある。   In view of the above problems, an object of the present invention is to provide a power transmitting device and a power receiving device in a wireless power transmission system that can secure a capacitance value between passive electrodes without excessively increasing the area of the passive electrodes. It is in.

本発明に係るワイヤレス電力伝送システムにおける送電装置は、送電側アクティブ電極および送電側パッシブ電極を内部に配する筐体と、この筐体と送電側アクティブ電極との間に配される第１誘電体と、前記筐体と送電側パッシブ電極との間に配される第２誘電体と、を備え、第２誘電体の誘電率は第１誘電体の誘電率よりも高い。   A power transmission device in a wireless power transmission system according to the present invention includes a housing in which a power transmission side active electrode and a power transmission side passive electrode are disposed, and a first dielectric disposed between the housing and the power transmission side active electrode. And a second dielectric disposed between the housing and the power transmission side passive electrode, and the dielectric constant of the second dielectric is higher than the dielectric constant of the first dielectric.

この構成では、パッシブ電極間の静電容量値を第２誘電体の誘電率で稼ぐことができる。すなわち、パッシブ電極の面積を増大することなくパッシブ電極間の静電容量値を増大することができる。したがって、小型でありながら電力伝送効率の高い送電装置が構成できる。   In this configuration, the capacitance value between the passive electrodes can be earned by the dielectric constant of the second dielectric. That is, the capacitance value between the passive electrodes can be increased without increasing the area of the passive electrodes. Therefore, it is possible to configure a power transmission device that is small but has high power transmission efficiency.

また、この構成では、アクティブ電極間の静電容量値に比べてパッシブ電極間の静電容量値をより増大させることができるため、パッシブ電極間の電圧変動値を抑えることができる。したがって、送電装置のパッシブ電極の電位を安定化できる。   Further, in this configuration, the capacitance value between the passive electrodes can be increased more than the capacitance value between the active electrodes, so that the voltage fluctuation value between the passive electrodes can be suppressed. Therefore, the potential of the passive electrode of the power transmission device can be stabilized.

本発明に係るワイヤレス電力伝送システムにおける受電装置は、受電側アクティブ電極および受電側パッシブ電極を内部に配する筐体と、この筐体と受電側アクティブ電極との間に配される第１誘電体と、前記筐体と送電側パッシブ電極との間に配される第２誘電体と、を備え、第２誘電体の誘電率は第１誘電体の誘電率よりも高い。   A power receiving device in a wireless power transmission system according to the present invention includes a housing in which a power receiving side active electrode and a power receiving side passive electrode are disposed, and a first dielectric disposed between the housing and the power receiving side active electrode. And a second dielectric disposed between the housing and the power transmission side passive electrode, and the dielectric constant of the second dielectric is higher than the dielectric constant of the first dielectric.

この構成では、パッシブ電極間の静電容量値を第２誘電体の誘電率で稼ぐことができる。すなわち、パッシブ電極の面積を増大することなくパッシブ電極間の静電容量値を増大することができる。したがって、小型でありながら電力伝送効率の高い受電装置が構成できる。   In this configuration, the capacitance value between the passive electrodes can be earned by the dielectric constant of the second dielectric. That is, the capacitance value between the passive electrodes can be increased without increasing the area of the passive electrodes. Therefore, it is possible to configure a power receiving device that is small and has high power transmission efficiency.

また、この構成では、アクティブ電極間の静電容量値に比べてパッシブ電極間の静電容量値をより増大させることができるため、パッシブ電極間の電圧変動値を抑えることができる。したがって、受電装置のパッシブ電極の電位を安定化できる。   Further, in this configuration, the capacitance value between the passive electrodes can be increased more than the capacitance value between the active electrodes, so that the voltage fluctuation value between the passive electrodes can be suppressed. Therefore, the potential of the passive electrode of the power receiving device can be stabilized.

本発明に係る送電装置または受電装置は、パッシブ電極の面積を増大することなくパッシブ電極間の静電容量値を増大することができる。   The power transmitting device or power receiving device according to the present invention can increase the capacitance value between the passive electrodes without increasing the area of the passive electrodes.

本発明の第１実施形態に係る受電装置を送電装置に載置した場合における両装置のパッシブ電極間が容量結合したときの等価回路図である。It is an equivalent circuit diagram when the passive electrodes of both devices are capacitively coupled when the power receiving device according to the first embodiment of the present invention is placed on the power transmission device. 本発明の第1実施形態に係る受電装置を送電装置に載置した場合における両装置のアクティブ電極間およびパッシブ電極間の電圧波形を示す図である。FIG. 3 is a diagram showing voltage waveforms between active electrodes and passive electrodes of both devices when the power receiving device according to the first embodiment of the present invention is placed on the power transmission device. 本発明の第１実施形態に係る送電装置および受電装置の構成を示す側面断面図である。It is side surface sectional drawing which shows the structure of the power transmission apparatus and power receiving apparatus which concern on 1st Embodiment of this invention. 本発明の第１実施形態に係る送電装置の構成を示す平面図である。It is a top view which shows the structure of the power transmission apparatus which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る送電装置の構成を示すＡ−Ａ断面図である。It is AA sectional drawing which shows the structure of the power transmission apparatus which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る受電装置の構成を示す平面図である。It is a top view which shows the structure of the power receiving apparatus which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る受電装置の構成を示すＢ−Ｂ断面図である。It is BB sectional drawing which shows the structure of the power receiving apparatus which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る送電装置の構成の別の例を示す平面図である。It is a top view which shows another example of a structure of the power transmission apparatus which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る送電装置の構成の別の例を示す平面図である。It is a top view which shows another example of a structure of the power transmission apparatus which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る送電装置および受電装置の構成を示す側面断面図である。It is side surface sectional drawing which shows the structure of the power transmission apparatus and power receiving apparatus which concern on 2nd Embodiment of this invention. 本発明の第３実施形態に係る送電装置および受電装置の構成を示す側面断面図である。It is side surface sectional drawing which shows the structure of the power transmission apparatus and power receiving apparatus which concern on 3rd Embodiment of this invention.

以下、本発明の実施形態に係るワイヤレス電力伝送装置を、図面を参照しつつ詳細に説明する。   Hereinafter, a wireless power transmission device according to an embodiment of the present invention will be described in detail with reference to the drawings.

まず、本発明の第１実施形態について説明する。   First, a first embodiment of the present invention will be described.

図１は、受電装置を送電装置に載置した場合における両装置のパッシブ電極間が容量結合したときの等価回路図である。   FIG. 1 is an equivalent circuit diagram when the passive electrodes of both devices are capacitively coupled when the power receiving device is mounted on the power transmitting device.

送電装置１００は、入力電源１０６および交流電力発生回路１０７を備えている。入力電源１０６は、１００Ｖ〜２３０Ｖの交流電圧から変換した５Ｖ、１２Ｖ等の直流電圧電源であり、交流電力発生回路１０７へ出力する。交流電力発生回路１０７は、インバータ１０８、昇圧トランスＴＧ及びインダクタＬＧ等により構成され、送電側アクティブ電極１２０および送電側パッシブ電極１３０の間に高周波高電圧を印加する。この電圧の周波数は例えば１００ｋＨｚ〜１０ＭＨｚの範囲である。   The power transmission device 100 includes an input power source 106 and an AC power generation circuit 107. The input power supply 106 is a DC voltage power supply such as 5 V or 12 V converted from an AC voltage of 100 V to 230 V, and outputs it to the AC power generation circuit 107. The AC power generation circuit 107 includes an inverter 108, a step-up transformer TG, an inductor LG, and the like, and applies a high frequency high voltage between the power transmission side active electrode 120 and the power transmission side passive electrode 130. The frequency of this voltage is in the range of 100 kHz to 10 MHz, for example.

受電装置２００の受電側アクティブ電極２２０と受電側パッシブ電極２３０との間には、インダクタＬＬ、降圧トランスＴＬおよび負荷ＲＬによる負荷回路２０５が接続されている。負荷ＲＬは、図示しない整流平滑回路及び二次電池で構成されている。   A load circuit 205 including an inductor LL, a step-down transformer TL, and a load RL is connected between the power receiving side active electrode 220 and the power receiving side passive electrode 230 of the power receiving device 200. The load RL includes a rectifying / smoothing circuit and a secondary battery (not shown).

図２は、受電装置を送電装置に載置した場合における両装置のアクティブ電極間およびパッシブ電極間の電圧波形を示す図である。   FIG. 2 is a diagram illustrating voltage waveforms between the active electrodes and the passive electrodes of both devices when the power receiving device is mounted on the power transmitting device.

受電装置２００と送電装置１００の送受対向面同士を対向させると、アクティブ電極１２０，２２０間が容量結合し、パッシブ電極１３０，２３０間が容量結合する。これにより、アクティブ電極１２０，２２０間に所定の電圧Ｖ１が印加され、パッシブ電極１３０，２３０間に所定の電圧Ｖ２が印加される。   When the transmission / reception facing surfaces of the power reception device 200 and the power transmission device 100 are opposed to each other, the active electrodes 120 and 220 are capacitively coupled, and the passive electrodes 130 and 230 are capacitively coupled. As a result, a predetermined voltage V 1 is applied between the active electrodes 120 and 220, and a predetermined voltage V 2 is applied between the passive electrodes 130 and 230.

アクティブ電極１２０，２２０間に生じる容量（Ｃ１）を通る電荷＝パッシブ電極１３０，２３０間に生じる容量（Ｃ２）を通る電荷＝Ｑとすると、Ｑ＝Ｃ１・Ｖ１＝Ｃ２・Ｖ２である。したがって、Ｃ１＜Ｃ２ならばＶ１＞Ｖ２となる。   If the charge passing through the capacitance (C1) generated between the active electrodes 120 and 220 = the charge passing through the capacitance (C2) generated between the passive electrodes 130 and 230 = Q, then Q = C1 · V1 = C2 · V2. Therefore, if C1 <C2, V1> V2.

すなわち、アクティブ電極１２０，２２０間の容量に比べてパッシブ電極１３０，２３０間の容量を大きくすると、パッシブ電極間電圧Ｖ２は小さくなり、受電装置２００の基準電位（パッシブ電極２３０の電位）変動は小さくなる。   That is, when the capacitance between the passive electrodes 130 and 230 is made larger than the capacitance between the active electrodes 120 and 220, the voltage V2 between the passive electrodes becomes small, and the fluctuation of the reference potential (the potential of the passive electrode 230) of the power receiving device 200 is small. Become.

図３は、送電装置および受電装置の構成を示す側面断面図である。図４は、送電装置の構成を示す平面図である。図５は、送電装置の構成を示すＡ−Ａ断面図である。   FIG. 3 is a side cross-sectional view illustrating configurations of the power transmission device and the power reception device. FIG. 4 is a plan view showing the configuration of the power transmission device. FIG. 5 is a cross-sectional view taken along line AA showing the configuration of the power transmission device.

送電装置１００は、筐体１１０、アクティブ電極１２０、パッシブ電極１３０、第１誘電体１４０および第２誘電体１５０を備える。   The power transmission device 100 includes a housing 110, an active electrode 120, a passive electrode 130, a first dielectric 140, and a second dielectric 150.

筐体１１０の上面は平板状に形成されている。筐体１１０は、例えば、ポリカーボネート樹脂や高剛性グレードのＡＢＳ等、剛性の高い素材で構成される。   The upper surface of the housing 110 is formed in a flat plate shape. The casing 110 is made of a highly rigid material such as polycarbonate resin or high-rigidity grade ABS.

アクティブ電極１２０は、筐体１１０内に配される。アクティブ電極１２０は、平面視において矩形状を呈する。アクティブ電極１２０は、銅やアルミニウム等の金属体で構成される。アクティブ電極１２０は、筐体１１０内において接着剤１２２で固着している。アクティブ電極１２０およびパッシブ電極１３０は交流電力発生回路１０７と電気的に接続されている。   The active electrode 120 is disposed in the housing 110. The active electrode 120 has a rectangular shape in plan view. The active electrode 120 is made of a metal body such as copper or aluminum. The active electrode 120 is fixed inside the casing 110 with an adhesive 122. The active electrode 120 and the passive electrode 130 are electrically connected to the AC power generation circuit 107.

パッシブ電極１３０は、筐体１１０内においてアクティブ電極１２０に近接して配されている。具体的には、パッシブ電極１３０は、平面視において、アクティブ電極１２０に対して所定距離だけ離間してアクティブ電極１２０を囲むように配されている。パッシブ電極１３０は、銅やアルミニウム等の金属体で構成される。パッシブ電極１３０は、筐体１１０内において接着剤１３２で固着している。   The passive electrode 130 is disposed in proximity to the active electrode 120 in the housing 110. Specifically, the passive electrode 130 is disposed so as to surround the active electrode 120 with a predetermined distance from the active electrode 120 in plan view. The passive electrode 130 is made of a metal body such as copper or aluminum. The passive electrode 130 is fixed inside the housing 110 with an adhesive 132.

第１誘電体１４０は、筐体１１０とアクティブ電極１２０との間に配されている。第１誘電体１４０は、筐体１１０に対して接着剤等で固着している。第１誘電体１４０は、例えば、セラミック等の絶縁体から構成される。第１誘電体１４０の誘電率は１００未満である。例えばアクティブ電極１２０−２２０間に生じる容量の単位面積当たりの容量は０．０４６ｐＦ／ｍｍ２程度であり、アクティブ電極１２０の面積が９００ｍｍ２としてその面積すべてにおいてアクティブ電極２２０と対向する場合、アクティブ電極１２０−２２０間に生じる容量は４１ｐＦ程度である。The first dielectric 140 is disposed between the housing 110 and the active electrode 120. The first dielectric 140 is fixed to the housing 110 with an adhesive or the like. The first dielectric 140 is made of an insulator such as ceramic. The dielectric constant of the first dielectric 140 is less than 100. For example, capacitance per unit area of the capacitance generated between the active electrodes 120-220 is about 0.046pF / mm 2, if the area of the active electrode 120 is opposed to the active electrode 220 in all its area as 900 mm 2, the active electrode The capacitance generated between 120 and 220 is about 41 pF.

第２誘電体１５０は、筐体１１０とパッシブ電極１３０との間に配されている。第２誘電体１５０は、筐体１１０に対して接着剤等で固着している。第２誘電体１５０は、第１誘電体１４０の誘電率よりも誘電率が高い材料で構成される。第２誘電体１５０の誘電率は、第１誘電体１４０の誘電率の１００倍以上であることが好ましい。例えばパッシブ電極１３０−２３０間に生じる容量の単位面積当たりの容量は６．６７ｐＦ／ｍｍ２程度であり、パッシブ電極１３０の面積が５４１４ｍｍ２としてその面積すべてにおいてパッシブ電極２３０と対向する場合、パッシブ電極１３０−２３０間に生じる容量は３．６ｎＦ程度である。The second dielectric 150 is disposed between the housing 110 and the passive electrode 130. The second dielectric 150 is fixed to the housing 110 with an adhesive or the like. The second dielectric 150 is made of a material having a dielectric constant higher than that of the first dielectric 140. The dielectric constant of the second dielectric 150 is preferably 100 times or more that of the first dielectric 140. For example capacitance per unit area of the capacitance generated between the passive electrodes 130-230 is about 6.67pF / mm 2, if the area of the passive electrode 130 is opposed to the passive electrode 230 in all its area as 5414mm 2, the passive electrode The capacitance generated between 130 and 230 is about 3.6 nF.

この構成では、パッシブ電極１３０，２３０間の容量値を第２誘電体１５０の誘電率で稼ぐことができる。すなわち、パッシブ電極１３０の面積を増大することなくパッシブ電極１３０，２３０間の静電容量値を増大することができる。したがって、送電装置１００および受電装置２００の大型化を抑制することができる。   In this configuration, the capacitance value between the passive electrodes 130 and 230 can be earned by the dielectric constant of the second dielectric 150. That is, the capacitance value between the passive electrodes 130 and 230 can be increased without increasing the area of the passive electrode 130. Therefore, the enlargement of the power transmission device 100 and the power reception device 200 can be suppressed.

また、この構成では、アクティブ電極１２０，２２０間の容量値に比べてパッシブ電極１３０，２３０間の容量値を大きくしているため、パッシブ電極１３０，２３０間に掛かる電圧は小さくなる。したがって、パッシブ電極１３０，２３０の電位を安定させることができる。   Further, in this configuration, since the capacitance value between the passive electrodes 130 and 230 is larger than the capacitance value between the active electrodes 120 and 220, the voltage applied between the passive electrodes 130 and 230 is reduced. Therefore, the potentials of the passive electrodes 130 and 230 can be stabilized.

図６は、受電装置の構成を示す平面図である。図７は、受電装置の構成を示すＢ−Ｂ断面図である。   FIG. 6 is a plan view illustrating a configuration of the power receiving device. FIG. 7 is a cross-sectional view taken along the line BB showing the configuration of the power receiving device.

受電装置２００は、筐体２１０、アクティブ電極２２０、パッシブ電極２３０、第１誘電体２４０および第２誘電体２５０を備える。受電装置２００は、例えば、携帯電話、タブレットＰＣ、ノート型ＰＣなどの電子機器が装着されて使用されるものである。   The power receiving device 200 includes a housing 210, an active electrode 220, a passive electrode 230, a first dielectric 240 and a second dielectric 250. The power receiving apparatus 200 is used by being mounted with an electronic device such as a mobile phone, a tablet PC, or a notebook PC.

筐体２１０の下面は平板状に形成されている。筐体２１０は剛性が高い素材で構成されている。筐体２１０は、例えば、ポリカーボネート樹脂や高剛性グレードのＡＢＳ等で構成される。 The lower surface of the housing 210 is formed in a flat plate shape. The casing 210 is made of a material having high rigidity. The casing 210 is made of, for example, polycarbonate resin, high-rigidity grade ABS, or the like.

アクティブ電極２２０は、筐体２１０内に配されている。アクティブ電極２２０は、平面視において矩形状を呈する。アクティブ電極２２０は、銅やアルミニウム等の金属体で構成される。アクティブ電極２２０は、筐体２１０内において接着剤等で固着されている。アクティブ電極２２０およびパッシブ電極２３０には負荷回路２０５の一部２０５Ｐが接続されている。この負荷回路の一部２０５Ｐは図１に示した負荷回路２０５のうち負荷ＲＬ以外の部分であり、タブレットＰＣのコネクタに刺さるプラグまたはレセプタクルを備えている。   The active electrode 220 is disposed in the housing 210. The active electrode 220 has a rectangular shape in plan view. The active electrode 220 is made of a metal body such as copper or aluminum. The active electrode 220 is fixed inside the casing 210 with an adhesive or the like. A part 205 </ b> P of the load circuit 205 is connected to the active electrode 220 and the passive electrode 230. A part 205P of the load circuit is a part other than the load RL in the load circuit 205 shown in FIG. 1, and includes a plug or a receptacle that pierces a connector of the tablet PC.

パッシブ電極２３０は、筐体２１０内においてアクティブ電極２２０に近接して配される。具体的には、パッシブ電極２３０は、平面視において、アクティブ電極２２０に対して所定距離だけ離間してアクティブ電極２２０を囲むように配される。パッシブ電極２３０は、銅やアルミニウム等の金属体で構成される。パッシブ電極２３０は、筐体２１０内において接着剤等で固着している。   The passive electrode 230 is disposed in the housing 210 in the vicinity of the active electrode 220. Specifically, the passive electrode 230 is disposed so as to surround the active electrode 220 with a predetermined distance from the active electrode 220 in plan view. The passive electrode 230 is made of a metal body such as copper or aluminum. The passive electrode 230 is fixed inside the casing 210 with an adhesive or the like.

第１誘電体２４０は、筐体２１０とアクティブ電極２２０との間に配されている。第１誘電体２４０は、筐体２１０に対して接着剤等で固着されている。第１誘電体２４０は、例えば、セラミック等の絶縁体から構成される。第１誘電体２４０の誘電率は、１００未満である。   The first dielectric 240 is disposed between the casing 210 and the active electrode 220. The first dielectric 240 is fixed to the casing 210 with an adhesive or the like. The first dielectric 240 is made of an insulator such as ceramic. The dielectric constant of the first dielectric 240 is less than 100.

第２誘電体２５０は、筐体２１０とパッシブ電極２３０との間に配されている。第２誘電体２５０は、筐体２１０に対して接着剤等で固着されている。第２誘電体２５０は、第１誘電体２４０の誘電率よりも誘電率が高い材料で構成される。第２誘電体２５０の誘電率は、第１誘電体２４０の誘電率の１００倍以上であることが好ましい。   The second dielectric 250 is disposed between the casing 210 and the passive electrode 230. The second dielectric 250 is fixed to the casing 210 with an adhesive or the like. The second dielectric 250 is made of a material having a dielectric constant higher than that of the first dielectric 240. The dielectric constant of the second dielectric 250 is preferably 100 times or more that of the first dielectric 240.

この構成では、パッシブ電極２３０，１３０間の容量値を第２誘電体２５０の誘電率で稼ぐことができる。すなわち、パッシブ電極２３０の面積を増大することなくパッシブ電極２３０，１３０間の容量値を増大することができる。したがって、受電装置２００の大型化を抑制することができる。   In this configuration, the capacitance value between the passive electrodes 230 and 130 can be earned by the dielectric constant of the second dielectric 250. That is, the capacitance value between the passive electrodes 230 and 130 can be increased without increasing the area of the passive electrode 230. Therefore, an increase in size of the power receiving device 200 can be suppressed.

また、この構成では、アクティブ電極２２０，１２０間の容量値に比べてパッシブ電極２３０，１３０間の容量値を増大させているため、パッシブ電極２３０，１３０間に掛かる電圧は小さくなる。したがって、パッシブ電極２３０，１３０間の電位を安定させることができる。   In this configuration, since the capacitance value between the passive electrodes 230 and 130 is increased compared to the capacitance value between the active electrodes 220 and 120, the voltage applied between the passive electrodes 230 and 130 is reduced. Therefore, the potential between the passive electrodes 230 and 130 can be stabilized.

図８および図９は、送電装置の構成の別の例を示す平面図である。   8 and 9 are plan views illustrating another example of the configuration of the power transmission device.

パッシブ電極１３０は、平面視において、アクティブ電極１２０を完全に囲っていなくてもよい。また、パッシブ電極１３０は、平面視において、アクティブ電極１２０を挟んで対向して配されていてもよい。このように、アクティブ電極１２０およびパッシブ電極１３０の配置は特に限定されない。   The passive electrode 130 may not completely surround the active electrode 120 in plan view. In addition, the passive electrode 130 may be arranged to face each other with the active electrode 120 interposed therebetween in plan view. Thus, the arrangement of the active electrode 120 and the passive electrode 130 is not particularly limited.

また、第２誘電体１５０の厚みは、第１誘電体１４０の厚みと同じであると好ましい。   The thickness of the second dielectric 150 is preferably the same as the thickness of the first dielectric 140.

この構成では、送電装置１００の製造が容易となり、送電装置１００全体としてコストダウンをすることができる。   With this configuration, the power transmission device 100 can be easily manufactured, and the cost of the power transmission device 100 as a whole can be reduced.

さらに、第２誘電体２５０の厚みは、第１誘電体２４０の厚みと同じであると好ましい。   Furthermore, the thickness of the second dielectric 250 is preferably the same as the thickness of the first dielectric 240.

この構成では、受電装置２００の製造が容易となり、受電装置２００全体としてコストダウンをすることができる。   With this configuration, the power receiving device 200 can be easily manufactured, and the power receiving device 200 as a whole can be reduced in cost.

次に、本発明の第２実施形態について説明する。なお、本実施形態以降の各実施形態においては、第１実施形態で説明した内容を適宜省略する。   Next, a second embodiment of the present invention will be described. In each of the embodiments after this embodiment, the contents described in the first embodiment are omitted as appropriate.

図１０は、送電装置および受電装置の構成を示す側面断面図である。   FIG. 10 is a side cross-sectional view illustrating configurations of the power transmission device and the power reception device.

送電装置１００は、第１実施形態の構成に加えて、筐体１１０と第２誘電体１５０との間に配された導電性ゴム１６０をさらに備える。導電性ゴム１６０は本発明の導電体に相当する。   The power transmission apparatus 100 further includes a conductive rubber 160 disposed between the housing 110 and the second dielectric 150 in addition to the configuration of the first embodiment. The conductive rubber 160 corresponds to the conductor of the present invention.

この構成では、筐体１１０とパッシブ電極１３０との間に導電性ゴム１６０が配されているため、筐体１１０とパッシブ電極１３０との間の距離が確保される。すなわち、パッシブ電極１３０とパッシブ電極２３０との間の距離が確保される。したがって、パッシブ電極１３０とパッシブ電極２３０との間で放電が発生することを抑制することができる。   In this configuration, since the conductive rubber 160 is disposed between the housing 110 and the passive electrode 130, a distance between the housing 110 and the passive electrode 130 is ensured. That is, a distance between the passive electrode 130 and the passive electrode 230 is ensured. Therefore, it is possible to suppress the occurrence of discharge between the passive electrode 130 and the passive electrode 230.

また、この構成では、導電性ゴム１６０は所定の導電性を有するため、静電容量素子として考えた場合、導電性ゴム１６０はパッシブ電極１３０の一部と考えることができる。すなわち、パッシブ電極１３０とパッシブ電極２３０との電極間距離は、筐体１１０，２１０の厚みと第２誘電体１５０，２５０の厚みを足したもののみであるので、静電容量を発生させる電極間距離が実質的に短くなる。したがって、パッシブ電極１３０とパッシブ電極２３０との間で大きな静電容量を発生させることができるため、放電が発生することを抑制しつつ、パッシブ電極１３０ー２３０間の所定の容量を得ることができる。   In this configuration, since the conductive rubber 160 has a predetermined conductivity, the conductive rubber 160 can be considered as a part of the passive electrode 130 when considered as a capacitive element. That is, the interelectrode distance between the passive electrode 130 and the passive electrode 230 is only the sum of the thickness of the casings 110 and 210 and the thickness of the second dielectrics 150 and 250. The distance is substantially shortened. Accordingly, since a large capacitance can be generated between the passive electrode 130 and the passive electrode 230, a predetermined capacitance between the passive electrodes 130-230 can be obtained while suppressing the occurrence of discharge. .

また、上記では、導電ゴム１６０は筺体１１０と第２誘電体１５０との間に配されているが、筺体１１０と第１誘電体１４０との間に配されていてもよい。   In the above description, the conductive rubber 160 is disposed between the housing 110 and the second dielectric 150, but may be disposed between the housing 110 and the first dielectric 140.

導電性ゴム１６０は、第２誘電体１５０よりも柔らかい素材で構成されると好ましい。そのことにより、導電性ゴム１６０はクッション材の機能を有するため、第２誘電体１５０に対する衝撃を吸収することで第２誘電体１５０を保護することができる。   The conductive rubber 160 is preferably made of a material softer than the second dielectric 150. Accordingly, since the conductive rubber 160 has a function of a cushioning material, the second dielectric 150 can be protected by absorbing an impact on the second dielectric 150.

次に、本発明の第３実施形態について説明する。   Next, a third embodiment of the present invention will be described.

図１１は、送電装置および受電装置の構成を示す側面断面図である。   FIG. 11 is a side cross-sectional view illustrating configurations of the power transmission device and the power reception device.

筐体１１０は、金属材料から構成されている。筐体１１０の外表面は、金属酸化物で被覆されている。例えばアルミニウム基材の表面を酸化処理（アルマイト処理）することで絶縁膜を形成している。この構成では、金属酸化物の厚みは例えば２０μｍ〜３０μｍ程度である。   The housing 110 is made of a metal material. The outer surface of the housing 110 is covered with a metal oxide. For example, the insulating film is formed by oxidizing (alumite treatment) the surface of the aluminum substrate. In this configuration, the thickness of the metal oxide is, for example, about 20 μm to 30 μm.

また上記では、筺体１１０の外表面が金属酸化物で被覆されているが、筺体２１０の外表面が金属酸化物で被覆されていてもよい。   In the above description, the outer surface of the casing 110 is coated with the metal oxide, but the outer surface of the casing 210 may be coated with the metal oxide.

最後に、上述の実施形態の説明は、すべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上述の実施形態ではなく、特許請求の範囲によって示される。さらに、本発明の範囲には、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。   Finally, the description of the above-described embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

１００−送電装置
１１０−筐体
１２０−アクティブ電極
１３０−パッシブ電極
１４０−第１誘電体
１５０−第２誘電体
１６０−導電性ゴム（導電体）
２００−受電装置
２１０−筐体
２２０−アクティブ電極
２３０−パッシブ電極
２４０−第１誘電体
２５０−第２誘電体100-power transmission device 110-housing 120-active electrode 130-passive electrode 140-first dielectric 150-second dielectric 160-conductive rubber (conductor)
200-Power receiving device 210-Housing 220-Active electrode 230-Passive electrode 240-First dielectric 250-Second dielectric

Claims (4)

送受対向面に沿って設けられている送電側アクティブ電極および送電側パッシブ電極と、第１端が前記送電側アクティブ電極に接続され、第２端が前記送電側パッシブ電極に接続された交流電力発生回路と、を有する送電装置と、
送受対向面に沿って設けられている受電側アクティブ電極および受電側パッシブ電極と、第１端が前記受電側アクティブ電極に接続され、第２端が前記受電側パッシブ電極に接続された負荷回路と、を有する受電装置と、
を備えるワイヤレス電力伝送システムにおける送電装置において、
前記送電側アクティブ電極および前記送電側パッシブ電極を内部に配する筐体と、
前記筐体と前記送電側アクティブ電極との間に配される第１誘電体と、
前記筐体と前記送電側パッシブ電極との間に配される第２誘電体と、
前記筐体と前記第１誘電体または前記第２誘電体との間に配された導電体と、
を備え、
前記第２誘電体の誘電率は、前記第１誘電体の誘電率よりも高い、送電装置。 AC power generation in which a power transmission side active electrode and a power transmission side passive electrode provided along a transmission / reception facing surface, a first end connected to the power transmission side active electrode, and a second end connected to the power transmission side passive electrode A power transmission device having a circuit;
A power-receiving-side active electrode and a power-receiving-side passive electrode provided along a transmission / reception facing surface; a load circuit having a first end connected to the power-receiving-side active electrode and a second end connected to the power-receiving-side passive electrode; A power receiving device having
In a power transmission device in a wireless power transmission system comprising:
A casing in which the power transmission side active electrode and the power transmission side passive electrode are arranged, and
A first dielectric disposed between the housing and the power transmission side active electrode;
A second dielectric disposed between the housing and the power transmission side passive electrode;
A conductor disposed between the housing and the first dielectric or the second dielectric;
With
The power transmission device, wherein a dielectric constant of the second dielectric is higher than a dielectric constant of the first dielectric. 前記第２誘電体の厚みは、前記第１誘電体の厚みと同じである、請求項１に記載の送電装置。   The power transmission device according to claim 1, wherein a thickness of the second dielectric is the same as a thickness of the first dielectric. 前記導電体は前記筐体と前記第２誘電体との間に配されており、
前記筐体の送受対向面と前記送電側パッシブ電極との間の距離は、前記筐体の送受対向面と前記送電側アクティブ電極との距離よりも大きい、請求項１または２に記載の送電装置。 The conductor is disposed between the housing and the second dielectric;
The power transmission device according to claim 1 or 2 , wherein a distance between the transmission / reception facing surface of the casing and the power transmission side passive electrode is larger than a distance between the transmission / reception facing surface of the casing and the power transmission side active electrode. . 前記筐体は、金属材料から構成され、
前記筐体の外表面は、金属酸化物で被覆されている、
請求項１〜３のいずれか１項に記載の送電装置。 The housing is made of a metal material,
The outer surface of the housing is coated with a metal oxide,
The power transmission device according to any one of claims 1 to 3 .
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